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Buses, Bankers and the Beer of Revenge
From Greek computers to aircraft carriers made of ice - a collection of 50 of the best stories from Justin Pollard’s Eccentric Engineer column in E&T magazine.
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20 May 2013 | IET London: Savoy Place, UK
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8 - 10 April 2014 | Midland Hotel, Manchester, UK
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Topic Title: short circuit Topic Summary: Created On: 19 March 2013 08:39 AM Status: Post and Reply |
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 19 March 2013 08:39 AM
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Why short circuit rating usually at 3 sec indicated by most of suppliers?, why not 1 sec, 2 sec?
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19 March 2013 09:01 AM
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3 seconds is a typical design limit for the clearance of a fault by back-up protection.
It's possible to specify other times - eg 1s, certainly in respect of cable short-circuit withstand, which may be used where the back-up protection will clear a fault inside this time. ------------------------- Jonno |
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